Pneumatic drill



- Sept. 29, 1925. c. A.`HU| TQU1ST PNEUMATIC DRILL Filed Oct. 29, 1925 LID' III l Patented Sept. 29, 1925.

UNITED STATES CHARLES A. HULTQUIST, or Los ANGELES, CALIFORNIA.

PNEUMATIC DRILL.

Application led October 29, 1923.l kSerial No. 671,352. l

To all 1li/10m t may concern Be it known that I, CHARLES A. HULT- Qursr, a citizen of the United States, residing at Los Angeles, county of Los Angeles and State of California, have invented a new and useful Pneumatic Drill, of which the following is a speciiication.

rI'his invention relates to rock drills of the elastic fluid operated type, and more especially to the type employing a water tube.

. lVhen pneumatic drills employing water tubes are used, said tubes are subject to breakage or clogging and, in either event,

the water tube must be removed and repaired or another one substituted for it. IVith prior drills of this type, it is necessary, in order to remove the water tube, to take the machine apart, and this entails the unbolting of at least three different parts of the drill and exposing the ends of said parts to the dust that is always present .during mining operations. The three parts mentioned are the hammer and feed cylinders and the valve block that is interposed between them. When these parts are again assembled, any dust remaining on their end faces prevents the making of leak-proof joints and such dust and even small particles of rock are very apt to fall into the air feed control port and lodge between the wall of the feed cylinder and the cup leather, doing injury to both.

Because of liability to injury by dust, if

v the repair be made in the mine, it has heretofore been customary and practically necessary to hoist the drilling machine to the surface of the earth and have the necessary repair to the water tube made in a shop. This hoisting of the machine to the surface consumes valuable time and also delays the hoisting machinery in the performance of other necessary operations, thus increasing the mining costs.

To overcome the foregoing objections I have previously invented a construction in which the feed cylinder and valve block are connected by a hinge, and a latch releasably holds the valve block closed upon the feed cylinder. With such construction, first disclosed in my copending application for patent, filed August 14, 1922, Serial No. 581,683, the air feed control port passes through the hinge pintle, and an object of their invention, is to simplify the construction so that the air feed port is protected from dust without the necessity of extending said'port. through the hinge pintle.

The accompanying drawings illustrate the invention: Y

Figure 1 is alongitudinal view of a pneumatic drill constructed in accordance with the provisions of this invention, a portionl of the drill steel being contract the view.

Fig. 2 is a plan view of the valve block, the hammer cylinder being omitted.

Fig. 3 is an enlarged fragmental section on the line indicated by 8 3', Figure 1.

Fig'. i is a longitudinal view of the valve.

Referring to the drawings, the valve block is indicated at 8 and is secured by bolts 9, or other suitable means, to the hammer cylinder 10. In the cylinder 10 is the usual hammer 50. yExtending transversely of the valve block 8 is a cylindrical chamber 11 in which is positioned a rotary valve 12'. The valve chamber 11 communicates through a port 13 with the bore 14 of the cylinder 10. Thus when the valve 12 is appropriately turned it permits the operating fluid to flow from the feed pipe 15k through the axial valve bore 28 and port 16 of the valve and through the port 18 to the cylinder bore.

The valve block 8 seats against the upper end of a feed cylinder 17 which contains the usual plunger 18 acted upon by compressed fluid to feed the cylinder 10 so that the drill steel will bey continually forced against the rock being operated` upon. In orderl to supply the feed cylinder 17 with compressed fluid, it has heretofore been customary to pass the iiuid from' the valve chamber to the feed cylinder, the port or duct for carrying the fluid passing from the valve block into the upper end of the feed cylinder across the joint 19 ybetween. the valve block yand the feed cylinder, and thus, when the valve block and feed cylinder were separated, particles of rock were quite -apt to lodge in the duct. I avoid this difficulty, even though the former/duct construction is retained, as will be made clear hereinafter.

A duct 20 in the wall of the feed cylinder communicates with the bore 14 of the feed cylinder and opens to the joint 19 so that, when the valve block is closed upon the cylinder, the duct 20 will communicate with a duct 25 in the valve block. l/Vhen the valve 12 is in the position shown in Figure 3, the ,duct 25 `communicates with a duct 26 eX- broken away toA tending.longitudinally,of the valve, andsaid duct v26 at the same time registers with a port 27 opening through the Wall of the valve chamber to theatmosphere, rDhis, as

t in the usual Vmanner by packing 32;contained in. a, recess in they valveblock 8-` The pacling82gsnrronnds the. tube 31 between oneendofthe,reqess, 3 3'` and allange 84 on the'Water,tube;l earing against the {iange 34J is. a fplug, which4 is vs cregv-threaded into tbevalvehloclg,

Waterftube implace. The ivater tube 31, as extends through the hammer, asindicated: in, ldottedliiesin Fig. 1. The alle., is"v supplied; with Water from. a snpply., pipeV 3,10t .through a duct. 311v inthe va ve blockA andfurnishes-r Watcrto the drill steel 44,"i amanner Well understood in this a t, v.

`"1`h e, v,alve.block.v 8 isprovided with anzear 41 tlrrongh {we hiclifk extends a. bolt. 42 constituting apintlefpr. ,pivot Whose-axis ,is parallel vvitlr the, longitudinal; axis of` the feed cylinderA 1f?, Iiintle 42A also extends thr'oiighanfearvof, the vfeed cylinder 17, thuslfhingedlyf, connecting. the. valve block andfcylindend'.' Y 'v `Pi,refeifaloly` theonter ends of the ducts 20., 25 are positioned so that the ear, 41 will close over thefiductQO, and theear 43overl theA duct 25vvh'e`n thelv'alve'blocleis swung into,` open position, tlnisinaling it. as impossible for' dusttoxlhave,a cess to saidducts as when yin closed position. T hns tnmiveeiociisjj y A, ,y

' lbef'entrained bythe opernti-ine,1 dust. cannot atingfluid `and ,lodge in lthe. `bore of the, feed cylindenbetween.theiplunger and the Wall ciLthe',ovllieder,y

On. hey ,side [of fthe valvey block opposite to thathavingthe,fvalveisa,longitadinalSlot 36 in which; is l'pivoted alatchQbolt, 37, `the pivoxtbeing indicated, at 3,8, 'The bolt is thnslldetacliably .holding the' adaptedfto extend; through a slotA 3Q in the feed cylinder 17, and the 4nut 40 of said bolt is adapted to bear against the feed cylinder to releasably hold:y the valve block closed upoifitlieY feed cylinder. To gain access to the Water tube 31, the latch bolt 37 Will be released ande the valve block will then be swung laterally on its pintle 42. rlhe operator will then unscrew move the Water tube 31.

l. claim:

1. ln a pneumatic drill, the combination of a feed cylinder having an ear, a valve block having an ear, a. pintle connecting the ears, a Waterl tube detachably engaging the. valve` block, andl a, valve mounted in the valve block, there beinganiair duct in the, valve. block controlled by the valvey and opening to the joint betiven the valve block and feed cylinder and there beingv an air duct iny the feed cylinder communicating with thebore of the'cylinderand with the rst duct Whenthe valve blocl is in closed position, the outerv ends ofthe ductszbeing positioned to be closed by the ears when' the valve block issivung into open position. y

2. l In a pneumatic drill, thev combination of a valve block hav-,ing a Waterf supply duct, a cylinder connectedeviththe valve block, a hammer in the cylinder, a Water tube receiving Water from said dncty and extending through the hammer and detachably enf gaging the valve. block to -supply Water to the drill, a feed cylinder hingedly connected to the valve block, thev feedcylinder having a duct communicating With the feedcylinder bore, the valve block having anvalve chamber and having: a duct connectingsaid chambeil with theduct in the feedcylinder when the valve block is closed on the feedcyl# inder, the hinge connection closing Athe outer ends of the last two ducts When the valve block is in open position, there beinga port in the valve block connecting'V the valve block Ywith vthe bore'of the hammer containingcylinder, a plunger in the feed cylinder, an valve in the valve chamber controlling the port and duct in the valve block, and lmeans to releasablyK hold thevalve block closed upon ythe A feed Cylinder.

Signed at Los Angeles, Calif., this 22d day of October, 1923.

onaninss A, HULToUis'r.

the plugV 3,5l and re-vk 

